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[Meaning a] chest.[1] [So called] from the separation [of the parts of the coffer] that happens upon its opening; or from something being heaped up [χεῖσθαι ] in it, something such as is placed inside; or from its containing [χωρεῖν ] things placed in it.[2]
Also [sc. attested is] χηλῷ ("in a coffer"), [meaning] in a chest.[3]

[1] This gloss is found in Etymologicum Genuinum and Etymologicum Magnum 811.12; see also Lexicum Ambrosianum 220 (according to Adler), ps.-Herodian 150 and the scholia to Homer, Iliad 16.221 (where the genitive singular of the headword appears: web address 1).
[2] The rationale behind this last etymology is that a synonym for χωρέω is χάω , which would provide the necessary root for χηλός . [However, χάω is an artificial and late word and not the source of the root of χηλός ; see LSJ s.v. χάω at web address 2 below.] The true derivation of the headword is more probably from χαίνω /χάσκω , "to gape; open".
[3] The form here is the dative singular, which appears in Homer, Iliad 254 and Odyssey 13.10.